Looper mechanism for sewing-machines.



No. 875,623. PATENTED DEC. 31, 1907.1 W. N. PARKES.

LOOPER MECHANISM FOR SEWING MACHINES, APPLICATION I'ILED SEPT. 9, 1005.

2 SHEETSSHE,ET 1.

I EATENTEDDEG.31.1907. W. N. PARKES.

LOOPER MEGHANISMPOR SEWING MACHINES.

APPLICATION FILED SEPT. 9, 1905.

2 SHEET.SSHEET Z.

Hum-" W.

w 3 Influx WITNESSES:- 1 9 I INVENTORJ Wild ATTORNEYS fsrhrns rr rnnrorrrcn.

tar N. PARKES, or BROOKI IY NZ, NEW YORK- worse MECHANISM FOR snwnrqfili cirmn'sw To all tvlzomit may concern. 1

. Be it known that 1, WILLIAM N, PIARKES, a

citizen offthe United States, residing in Brooklyn, county of Kings,. and State of New York, have invented a new and useful Improvement in Looper Mechanism for Sewing-MachineS, 1 of which the following is a description, v

This inventionhas reference to lock stitch sewi machines, 'and'it belongs to the looper or hoo mechanisms of'such machines.

I OnJune 9*, 1903 U. S. Patent No. 730,692-

was' issued to applicant, in which an improved form of looper mechanism is shown mechanisms along the same lines disclose the-said patent.

described and cla'med. f Y

The main obje t of my present m-vention is to make further improvements in lokzper These improvements. consist "mainly of constructing thehook and bobbin case 1 shownin the said patent so there is abetter bearing between the said elements, and to so locate said bearingithat the bobbin case is better balanced in the hook, to improve the bobbin case relative to the delivery of the the location of '.t e parts thereof and their I looper, thread case and bobbin, the parts.

thread from the same, and to make. certain other im rovements in connection with-protecting t e thread from thebeak of the hook, and in connection with the delivery of the needle thread 100 from hook.

Referring to the drawings: Figure 1 is a view showing only so much of an organized sewing machine as is deemed necessary to illustrate the ap licatio'n of this invention,

cooperation with the other elements of the machine, the'vi'ew being partially an end ele-' vation and partially a transverse section taken across the frame of the machine at the end of the head of the latter; I Fig. 2 shows in vertical section the several arts of the being dismembered andshown in assembling position; Fig. 3 is'a, perspective view corre- ,sponding' to .the sectional-view of Fig; 2;

Fig. 4 is an elevation of-thehook side .of the:

looper, a portion being broken away'so as to show theneedle thread loop as it is about to be drawn from thelooper through, the space between the bearings of the parts; Fig. 5 is a view similar to Fig 4, but showing a different .l' position of the'looper relatively to the-thread ICE/Se and the loop of needle thread about to escape from-the loop'er through the spacebetween thebearing of the parts, and F1g.--6

Specification of Letters Patent. v

Application filed September .9, 1905. Serial No. 277;774.

pending wall or ange 10,'having extending from said ledge.

PatentedDec. "31., 1907.".

. is a bottom plan viewof the outer and inner hooks and .co-acting. parts-.

' In the drawings, a represents the frame of the machine, I) the bearings and frame of the head, 0 the 'needle bar carrying the needle. 11. in bearin of ',the needle and reciprocatingr gate or swingi ame e, the owerbe of' which is jo'urna ed at f about the presser ar g, carrying the footh, coo rating with the feed dog '2', of an approved f d mechanism.

n The numeral 1" indicates a' large/ driving gear carried by the lower shaft potshown I of the machine, said gear me'shin t wi h a pinion 2 carried by the shaft 3',"'journal d verti i y aP- c ally in the frame of the machine prov d m nner, the said gear and pinion hav- 1ng'a atio of two-to-one so as to lmpart two .rotat ons of the loo er to one'reciprocation of the; needle and sai pinion 2 being secured in place by means of screws 4- assingthrough the circular head 5 of the sha 3 ,and tappeg into said pinion. Thehead 5 is PIOVI withthe flange 6 upon which rests the main wall or body 7 of the loope'r, screws 8 passing through said wall 7 into the flange 9 of the head '5. The 100 er is provided with the deat 'ts top the seat or ledge 11 and inner vertlca jvall 1 2 Bet een the body 7 and the de ending wall IO-is a chan nel 1-3, substantial y concentriciwith the axis ofthe loo er, in which channel 0 rates the auxiliary 00k 14, carried bythe p ate 15, se-

cured by Ine'ansfoi screws 16 to the bottom 17 of the thread or-gbjobbiri' case, "thelatter, in

thisfinstan'cegl; being provided with'the tubu lar spindle 18,'"for supporting the bobbin 19.

- The'thread case is provided 'withthe circumferential 'flange 2Q,-extending about almost its entire circumferencm which flange is located at the topof the casethere being but a small space 21 omitted for the purpose of thread clearance. The thread case is also provide with the fin er 22-, which cooperlocated in aplanesubstantially parallel with 1,10

terminates a thread delivery opening 27. A thread guiding bar is connected to theccase as shown Hi Fi this guiding bar serves to keep the bobbin thread from loppin down and being caught by the point of the eak of the book. This guide or'guard 28 might be constructed so as to form a tension on the thread, but in the present form of constructhread unwinds, the bobbin turns in an oppohe said channel is also to be observed.

site direction to that in wliich the hook turns,

this has a tendency to draw the thread 31 to the closed end of the delivery opening 27, said opening being so constructed that there is no tendency or liability of the thread escaping from the delivery opening 27 after it has beenbrought into the saine as shown in liig. 4. The thread when drawn into the delivery opening 27 also slips into the cut away portion 21 of the flange 20. The abutting end of this flange also serves to keep the.

thread properly. located in the opening 27.

Referring now to my present invention it is tobe noted that there are a number of importantimgrovements in the same over the inventions shown in my said patent and said copendm application. The flange on the inner wafi o the hook as shown in my said patft and application has been dispensed W1 1. The ledge 11, at the top of the inner wall of the hook that extends substantially over the channel 13, and the flange 20 on the peripheryot the bobbin case and at the top of th same that rests on said ledge are to be note as means by which a better bearing is seen ed between the hook and the bobbin case, in my presei-rtoinvention.

As a feature ofa nagpresent invention the fact that the bobbin tliread passage 27 in the wall of the bobbin ease is m a plane below the bearing between the hook and said bobbin case is to be observed. And it is to be further observed that the top of the channel 13,, inclines towards the periphery of the hook near the top of said channel. This c hltnnel extends upwa d-ly to a line which is horizontally just below? the extreme end 23 of the beak of the hook; and by inclining said channel as noted it leaves metal for the substantial ledge 11 which has been described. T he said channel is also shown inclinedin my said copending application, but it is not claimed therein, because it is one of the elesme'nts of my present invention. The inclining oi the end of the auxiliary or secondary hook 1 1 to correspond with the incline of This incline of said secondary hook will be clearly understood by referring to Fig. 2. It is to be understood that thepoint 23 of the beak of the hook is parallel with the periphery of the hook, and that by the construction of the channel 13 and the beak of the secondary erases hook 14- as explained, the point of the beak of the said secondary book may enter the beak the latter.

Viewing Fig. 2 now, it will be seen that the bobbin case may be lowered into the hook until the flange of the case 20, rests on the ledge 11 of the hook, the said flange is of such size that its vertical face contacts with the vertical wall 12 of the hook, thereby retaining the bobbin case in a central location in the hook. The auxiliary hook 14 may now be attached to the bottom of the bobbin case b T meahs of screws 16 (see Fig. 6) a small hub .3l being formed on the bottom of the case; and fits a hole 33 through the body 'of'the primary hook at the extreme point'of ortion 15 of the auxiliary hook 14, thereby ocating the same central with the bobbin case or the shaft 3. The diameter of the body or disk portion of the auxiliary hook is the same as the diameter of the flange or" wall 10 of the primary hook, so that when the said auxiliary hook is secured. to the bobbin case, the case is retained on its seat in the book by the disk portion of the auxiliary hook contacting with the edge of the wall 10. T he hook may now be placed on the head 5, so that the wall 7 of the hook rests on the horizontal projecting flange 6 and embraces the flange 9, thereby locating all the hook parts mentioned and bobbin case central with the axis of the shaft 3, screws 8 being new inserted secure the hook to its carrier.-

In the operation of the machine, the hook rotates in the direction indicated by the arrow 29 in Fig. 5. The needle is thrust through the work to its full extent, and has commenced to return a sufficient extent to throw out a loop which the beak 23 of the hook enters. Immediately after the beak 23-01 the hook enters the loop of needle thread, said loop is brought into cont-act with the auxiliary hook 14 which enters the beak of the hook at the'p oint 23 of the same. This engagement between the hook l4 and the needle loop, and the inclined slot 25 of the hook causes the needle loop to be rapidly passed down to the end of the slot 25, which is the base or throat of the beak of the hook as before noted. The limb of said needle loop that-runs to the material, drops into the opening 21 between the bobbin case and inner wall of the hook, and this limb runs down to the throat 34 of the auxiliary hook 14 which retains it in this position. On further movement of the primary hook, this limb of the loop swings under the bobbin case and the other limb, which runs through the needle to the supply of thread swings above the case. After the primary hook has made a suliicient movement forward to bring the base of the slot 25 a little overone half around from the point of loop engagement the loop has been carried over one half around the case, and the take-up now begins to draw up the loop. I In Fig. 4 the position of the loop is shown after it has been drawn from around, and from under the bobbin case. It will be noted that the flange 20 5 still overlaps the ledge 11 of the hook, this contact. continues until the loop is drawn well up or to about the position shown in Fig. 5, when the heel of the hook reaches the Q ening 21 in the flange of the bobbin case, t ereby permittingthe loop to be finally drawn from the hook. It is thus seen that thedelivery .o'fthe loop is deferred until nearly all of it has been drawn up, thus pre- Zenting the same from flopping around and thereby becoming tangled or broken. A

mechanism over the hook mechanisms of the itrrior art, among which the following are Enentioned. The bearing between the case 25 the hook'being'such, that the case is suspended or hangs on its bearing from the top, 'e liability of the case to' cant or wedge is voided, and the friction between the case and the hook is reduced to a minimum. The usual narrow flange and groove hearing be-. tween the case and the hook being avoided, theliability of the case wedging ins'aid groove by reason of pieces of thread or otherioreign matter lodging in the same is not present in :55 this hook mechanism.

to be noted that the end of the flange 20, serves to keep the ledge 11 free fromany'accumulation of lint or other-matter, said end being squared so that it carries along any lint 40 for ieces of thread that may lodge on the said is ge to the heel of the looper where it is dis- ;i-charged.

hook being at the top of the case, and above the thread delivery opening 27 in the case,

and the guide 28 at, or just above said openservesto retain the strand of bobbin noted that the bobbin is place-din the case so that it, the bobbin, in unwinding revolves 1n an opposite direction to that in .which'the hook revolves, which tends to keep the bobbin thread at the closed end of the opening 2? iifishown in Figs. 4 and 5. The bearing bee tween thecase and hook being at the top of 55 1h8.ca.aa,..the friction between the retalmng In this resepect it is Y The 0 ening 21 between the case and thethreadloop, a threadpassagein.tha'i all of finger and the thread as thelatter is drawn by the finger is reduced to a minimum.

It is obvious that when the case is provided with a bearing at or near its bottom,

and is restrained from turning with the hook .by a finger extending from the top thereof,

that the lateral strain on the case so far above its bearing causes more frictionthan when the bearing between the case; and the hook is just below .the restraining fin present invention. eral strain on the finger that restrains the bobbin case from turningwith the hook, and the further this finger is above the bearing between the case and. the hook the greater is the tendency of this lateral strain to tip the case over, and this causes additional friction between the case and its bearing.

er as i in my There is of course a lat- The auxiliary hook .14 serves to prevent side drag on the loop of needle thread. as the :beak of the 'hook enters the same-and it serves to retain the limb of the loopthat' passes under the bobbin case in such a posie tion that the hook may freely swing the same under'the case, and it assists very much in the passing of the loop around under the case with the least possible friction or strain on the thread. The body of the auxiliary hook which isin the form of a disk, serves as ameans for retaining the-bobbin case in its seat in the hook. By reason of this auxiliary hook, and

the construction of the primary hook so that the auxiliary hookcan pass within the beak of the primary hook, the point of the primary hook may be at or near the top of the bobbin case, and the said case is not called u on to assist in spreading of the loop, and t e side drag and friction on the 'thread from. this source is avoided. By reason of the point of the beak of the primary hook bein at the top ofthe same, the bearing between t e case and the hook may be at the top. of said primary hook and mayextend from the said point to the heel of the hook, .thereby permitting a maximum length of bearing between the hook and the case. The bearing between the hook and the case being at the top of the case and hook, serves to permit the hearing be- .tween the hook and the case preceding :the

delivery of the loop to remain in contact-until the loop of needle thread has been nearly drawn up, thus preventing the loop' from flopping around or from being caught by the beak of the book as it, the hook, starts on its second rotation. r

Having now described my invention what I desire to secure by Letters Patent is:

1. In a sewing machine, a loopermechanis located on said ledge and means for retain-' ing the same on the ledge, a gap insaid fla e for the reception of' a'limbof the 'Qnee e said bobbin case below saidgawand a thread I 2. In a sewing machine; a looper inechanism comprising ahook having a ledge and a beak, a bobbin case having a circumferential flange that is located on said ledge and means for retaining the same on the ledge, a gap in said flange for the reception of a limb of the needle thread loop, a thread passage in the wall of the bobbin case below said flange for the passage of the bobbin thread into said .gap and thence to the needle plate and the work, and a thread giiard disposed on said bobbin case above said gap by means of which the bobbin thread is guarded from be ing caught by the point of the beak of the hook. v i

3. In a sewing machine, a looper mechanism comprising a hook having a ledge, a bobbin case having a circumferential flange that is located on said ledge and means for retaining the same on the ledge, a gap in said flange for the reception of a limb of the needle thread loop, a'thread passage in they wall of said bobbin case below said gap, a thread guard disposed on said bobbin. ease above said gap, anda slot, in said bobbin case by means of which the bobbin thread may be in the gap.

erases drawn into said thread assage so as to run from thence upwardly ack of said thread guard.

4. In a sewing machine, a stitch-forming mechanism comprising a looper' havin a groove formed'therein and provided wit a. ledge near its top, a bobbin ease having a cir cumierential flange near itstop that is lo- I cated on said ledge, and an auxiliary hook having a beak extending'into said. groove.

5. In a sewing machine, a stitch-f0 mechanism comprising a looper having a ledge "nearits top, abobbin-case having a circumferential flange located on said led e and means for retaining the same on sand ledge, a gap in said flangefor the reception. of a limb of the needle thread loop, a thread passage in the wall of the bobbin-case below said gap, and a thread guard disposed on said bobbin case above said gap by means of which the strand of bobbin thread. is retained In testimony v hereof I have hereunto signed my name inthe presence of two subscribing witnesses.

WILLIAM N. PARKES. Witnesses J. B. MCGIRR,

WM. W. Karenina. 

